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Mixed Minerals

Sunday, 28 June 2020 06:00 PM

Introducing the "Mixed Minerals" gallery which is part of our New Additions galleries. This gallery contains mineral specimens for sale including pyrite, pyromorphite, pyrophyllite, pyrrhotite, schorl, and siderite and more from places like Quiruvilca mine, Santiago de Chuco prov., La Libertad dept., Peru, Ivanhoe Mine, Tennant Creek, Northern Territory, Australia, Asbestos mine, Nepaug, Connecticut, United States, Santa Eulalia, Chihuahua, Mexico, Gillette quarry, Middlesex Co., Connecticut, United States, and Spokane, Spokane Co., Washington, United States.

Pyrite

#AH53611
Locality
Quiruvilca mine, Santiago de Chuco prov., La Libertad dept., Peru 
Formula
FeS2 
Availability
Sold
Size
5 x 3.5 x 3 cm - Miniature 
Tagged
sulfide5  

Striated Pyrite crystals in cluster with 2-3mm Galena crystals. The specimen is highly reflective and bassy yellow color. 


Pyrite

Formula
FeS2 
Crystal System
Isometric 
Crystal Habit
Striated, Druse, Stalactitic 
Cleavage
Poor, Poor, None 
Luster
Metallic 
Color
pale brass yellow 
Streak
greenish black 
Class
Isometric - Diploidal 
Fracture
Conchoidal 
Hardness
6.5 
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Pyromorphite

#AH53607
Locality
Ivanhoe Mine, Tennant Creek, Northern Territory, Australia 
Formula
Pb5(PO4)3Cl 
Availability
Available
Price
$125.00
Size
10 x 5 x 3 cm - Cabinet 
Tagged
phosphate  

Greenish yellow prismatic crystals to 4mm on Hematite matrix. Pyromorphite from the Ivanhoe mine is nearly impossible to find and obtain on the market.

Obtained by Hampson in 1967.


Pyromorphite

Formula
Pb5(PO4)3Cl 
Crystal System
Hexagonal 
Crystal Habit
Crystals short to long prismatic, acicular, often hoppered terminations, rarely tabular to equant; radiating to branching groups, tapering to a point. Commonly rounded, globular, reniform, botryoidal. 
Cleavage
On {1011}, interrupted 
Luster
Resinous to subadamantine 
Color
Dark grass-green, green, yellow, yellow-orange, reddish orange, yellow-brown, brown, tan, grayish, may be colorless 
Streak
White 
Geological Setting
A secondary mineral in the oxidized zone of lead deposits 
Class
Hexagonal, 6/m - Dipyramidal 
Fracture
Uneven to subconchoidal 
Hardness
3.5–4 
Collection
Arnold G Hampson Collection

Pyrophyllite

#AH53609
Locality
Asbestos mine, Nepaug, Connecticut, United States 
Formula
Al2Si4O10(OH)2 
Availability
Sold
Size
8 x 5 x 5 cm - Sm Cabinet 

Silky and silvery divergent sprays of Pyrophyllite to 2cm.

Collected by Hampson in 1945.


Pyrophyllite

Formula
Al2Si4O10(OH)2 
Crystal System
Triclinic 
Crystal Habit
Earthy 
Cleavage
Perfect, None, None 
Luster
Pearly 
Color
brown green, brownish yellow, greenish, gray green, gray white 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Flexible 
Hardness
1.5-2 
Collection
Arnold G Hampson Collection

Pyrrhotite

on Quartz & Galena - #AH53585
Locality
Santa Eulalia, Chihuahua, Mexico 
Formula
Fe7S8 
Availability
Sold
Size
6.5 x 6 x 5 cm - Sm Cabinet 
Tagged
sulfide  

There are a handful of good Pyrrhotite localities having exceptional crystals. This locality is one of them. The crystals are well-defined and large at 1cm wide to 9mm thick. 


Pyrrhotite

Formula
Fe7S8 
Crystal System
Monoclinic 
Crystal Habit
Tabular, Platy, Massive - Granular 
Cleavage
Imperfect, Imperfect, None 
Luster
Metallic 
Color
bronze, bronze red, dark brown 
Streak
gray black 
Class
Monoclinic - Prismatic 
Fracture
Uneven 
Hardness
3.5-4 
Collection
Arnold G Hampson Collection

Schorl

tourmaline - #AH53606
Locality
Gillette quarry, Middlesex Co., Connecticut, United States 
Formula
NaFe2+3Al6(BO3)3Si6O18(OH)4 
Availability
Available
Price
$40.00
Size
8.5 x 6.5 x 4 cm - Sm Cabinet 
Tagged
pegmatite mineral  

Portions of large Schorl crystals to 4cm, not terminated with Quartz, Mica and Microcline, typical pegmatite assemblage.

It's an old-timer collected in 1946 by Arnold Hampson.


Schorl

Formula
NaFe2+3Al6(BO3)3Si6O18(OH)4 
Crystal System
Trigonal 
Crystal Habit
Acicular, Prismatic, Striated 
Cleavage
Indistinct, None, None 
Luster
Vitreous (Glassy) 
Color
black, brownish black, greenish black, bluish black 
Streak
brown 
Class
Trigonal - Ditrigonal Pyramidal 
Fracture
Brittle - Conchoidal 
Hardness
7.5 
Collection
Arnold G Hampson Collection
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Siderite

var. sphaerosiderite - #BN53590
Locality
Spokane, Spokane Co., Washington, United States 
Formula
FeCO3 
Availability
Sold
Size
4 x 4 x 4 cm - Miniature 
Tagged
carbonate  

Weird spheroidal brown formations of Siderite to 9mm.


Siderite

Formula
FeCO3 
Crystal System
Trigonal 
Crystal Habit
Tabular, Massive, Botryoidal 
Cleavage
Perfect, Perfect, Perfect 
Luster
Vitreous (Glassy) 
Color
yellowish brown, brown, gray, yellowish gray, greenish gray 
Streak
white 
Class
Trigonal - Hexagonal Scalenohedral 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
Collection
Dr. Buford Nichols Collection
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